Blasting cartridge



Filed April 8, 1955 Patented Dec. 14, 1937 UNITED STATES BLASTING CARTRIDGE George A. Merchant,

Chicago, and Roland Milan, Pinckneyville, Ill., assignors to Binkley Coal Company, Chicago, Ill., a. .corporation of Illinois Application April 8, 1935, Serial VNo.V 15,198

12 Claims. (Cl. 102-6) Our invention relates to improvements in blasting cartridge and has for one object to provide a new and improved form of liquid oxygen carbon blasting cartridge which will be stiff for handling, suiciently rigid to pack in the blasting hole, have long life and will be easily lled, impregnated, manipulated and discharged and which will have high explosive eiect. Other objects of our invention will appear from time to time throughout the specification and claims.

Our invention is illustrated more or less diagrammatically in the accompanying drawing, wherein- Figure 1 is a side elevation;

Figure 2 is a section along the line 2-2 of Figure' 1;

Figure 3 is a side elevation of one of the reinforcing strips.

Like parts are indicated by like characters throughout the specification and drawing I is a generally cylindrical canvas bag having a tapered closed end 2. Contained Within the cylindrical portion of the bag is an inner cylindrical bag 3 terminating at a distance from the closed end of the outer bag substantially equal to the length of the tapered portion and extendingoutwardly beyond the outer bag to provide a filling portion collapsible as a handle as indicated at 4. 'Ihus the inner and the outer bags are in register for a portion of their length giving throughout thecylindrical portion of the cartridge a double thickness layer. The inner and outerbags are joined together by longitudinal seams 5. The outer bag is somewhat larger than the inner bag so that the seams 5 dene longitudinal pockets between the inner and the outer bag. In these longitudinal pockets are contained relatively stiff reinforcing strips 6 which are made preferably Aof celotex or other similar material, and are of such Width that they do not entirely ll the bag and of such thickness that a dead air space is defined between the seam, the inner and outer bag and each edge of the stiffening strip. Thestiffening strips also extend only throughout thev cylindrical portion of the bag. 'l is a Vcarbon filler made of carbon black, lamp black, charcoal or any other similar nely divided oarbonaceous materialV and packed into the bag to distend it to the shape shown in Figure l, the bag being filled-with this material.

.8 is a detonator Aembedded in the carbonaceous filler. 9 indicates ablastingfuse extending from the detonator out through the bag and through the handle 4. This fuse may take the form of a Wire if the detonator is electric or merely a combustible fuse if the detonator is not electric. I0

is a copper tie 'ring closing the bag and holding the contents and the fuse snugly in position. The dead air' spacesV above referred to are indicated 'at l I and it will be notedtha't normally there are two 5 dead air spaces in each pocket. Y

In use, the bag assembled as indicated', has the celotex or similar stiffening strips vthrust into the pockets and is then filled with the carbonaceous g filling material, the detonator being inserted thereafter 'and the copper tie applied to hold the contents of the bag, the detonator and 'fuse in proper relationship' with the collapsed'portion of the bag vfurnishing the handle by which the cartridge may be manipulated. The 'contents of the bag is packed'in' tight enough so as 'to make a reasonably stiff cartridge.` The tapered'end i's sufcientlytapered'so that it needs no'reinforc'- ing. The long cylindrical portion is flexible enough so that the' celotex or other strips are needed to maintain it inalignment.' f

The entire assembled cartridge is then inserted inA a bath of liquid' oxygen which penetrating the 'cartridge through the fabri'c or 'canvas 'ofthe bag and the fcelotex" s trip'completely impregnates 'them' also, though 4under some circumstances other strips suchas paper board, which-is' not absorbent of liquid oxygen, may be used. The desirability ofv-'the' use 'o'f"celotex is that the space in the cartridge Ysacrificed to stiiening thelca'r- 30 tridge is still under these circumstances available to contain part of the explosive charge.' T

When fully impregnated, the cartridge is withdrawn from the bath, packed in the shot hole'and detonated to cause explosive combination of the liquid oxygen and the carbonaceous materialrincluding the celotex. The 'celotex has a triple7 function.' It stiiens the cartridge, `it, furnishes an insulation to prevent heating of the cartridge and s'o evaporation of the coldliq'uid oxygen and it furnishes a material to combine with some of the oxygen when 'explosion takes 'place'.4 The dead air spaces along the edge of-each of the celotex strips serve as ins'ulationonly to prevent heat absorption and so 'evaporation of the liquid '45 oxygen. When something other than' "celotex or similar materials are u sed, then the faculty of supporting combustionis 'sacrificed and also the rate' at 'which 'absorption'offliquid oxygen is sacrificed' because 'the r"celotex being pervious 50 permits the liquid foxy'gen'i toV penetrate Y throughdistinguished from devices heretofore used Where stiffening means were available which had to be perforated or special apertures had to be proa vided to permit ingress of liquid oxygen, thereby decreasing the rate of speed of saturation.

Another advantage of the double cloth lining is that if in thrusting the cartridge into the blasting hole the bag is torn, it will be only the outermost bag that will be torn, the inner bag will be held normally intact and the carbon will not be wasted. Moreover in dealing with a wet hole, the presence of the two layers of cotton or fabric with the air space between, insures longer life of the cartridge because what happens is that an ice jacket will form on the outer bag and serve as an insulation to protect the inner bag. f

We have in connection with the description of our invention suggested the use of celotex or a similar material because this is an especially well-known type of material which is suitable for our purpose. It is suitable because it is fibrous, felt-like and is made of combustible fiber and so has structural strength while being permeable to liquid oxygen. Many other types of artificial wood or material of that general character having the permeability, the fibrous structure and the combustible features might be used.

We claim: Y

1. A blasting cartridge comprising, a fabric bag, a plurality of longitudinally extending peripherally disposed and spaced reinforcing members contained therein, the combined width of which is materially less than the peripheral length of the bag, a carbonaceous filler for the bag, the filler and the reinforcing members being both impregnated with liquid oxygen.

2. A blasting cartridge comprising, a fabric bag, a plurality of longitudinally extending peripherally disposed and spaced airpockets contained therein, a reinforcing member contained within each pocket extending throughout the length thereof, the width of the member being materially less than the width of the pocket.

3. A blasting cartridge comprising, inner and outer fabric bags joined along longitudinal lines to form peripherally disposed air pockets, the

circumferential length of the inner fabric bag being materially less than the circumferential length of the outer bag. y

4. A blasting cartridgecomprising, inner and outer fabric bags joined along longitudinal lines to formj peripherally disposed air pockets, reinforcing members contained within said air pockets and extending substantially throughout the length thereof, the width of the reinforcing members being materially less than the width of the pockets in which they are located, air chambers being formed within the reinforcing pockets between the edges of the reinforcing members and the boundaries of the pockets.

5. A blasting cartridge comprising, inner and outer fabric bags, the inner bag being somewhat smaller than the outer, the bags being joined along a plurality of spaced longitudinal lines to form air pockets between them, the circumferential length of the inner fabric bag being materially less than the circumferential length of the outer bag.

6. A blasting cartridge comprising, inner and outer fabric bags, the inner bag being somewhat smaller than the outer, the bags being joined along a plurality of spaced longitudinal lines to form air pockets between them, longitudinally disposed reinforcing members contained one within each pocket and extending substantially throughout the length thereof, the width of the reinforcing members being materially less than the width of the pockets in which they are located, air chambers being formed within the reinforcing pockets between the edges of the reinforcing members and the boundaries of the pockets.

7. A blasting cartridge comprising, an inner and outerfabric bag, the outer bag tapering in one direction beyond the inner bag to a closed end, the inner bag extending beyond the opposed end of the outer bag and collapsible to form a handle.

8; A blasting cartridge comprising, an inner and outer fabric bag, the outer bag tapering in one direction beyond the inner bag to a closed end, the inner bag extending beyond the opposed end of the outer bag and collapsible to form a handle,'the two bags being joined along longitudinal lines to dene air pockets between them.

9. A blasting cartridge comprising, an inner and outer fabric bag, the outer bag tapering in one direction beyond the inner bag to a closed end, the inner bag extending beyond the opposed end of the outer bag and collapsible to form a handle, the two bags being joined along longitudinal lines to define air pockets between them and reinforcing strips contained within the air pockets and extending throughout their length.

10. A carbon oxygen cartridge comprising, a fabric bag adapted to contain a supply of carbonaceous material, longitudinally extended reinforcing strips located about the periphery of the bag and spaced one from another, the reinforcing strips being pervious and absorbent of liquid oxygen.

l1. A carbon oxygen cartridge comprising, a fabric bag adapted to contain a supply of carbonaceous material, longitudinally extended reinforcing strips located about the periphery of the bag and spaced one from another, the reinforcing strips being formed of relatively thick slabs of fibrous combustible material permeable to liquid oxygen and having structural strength and the like.

12. A blasting cartridge comprising an outer fabric bag having a cylindrical portion and a relatively short tapered closed end, a lining bag contained therein extending thereinto substantially the length of the cylindrical portion and extending therebeyond at :the rear to collapse and furnish a handle, the inner bag being slightly smaller than the outer, the two bags being joined along parallel longitudinal lines to provide longitudinal pockets extending the length of the cylindrical portion, stiffening strips of brous combustible material permeable to liquid oxygen and having structural strength or the like contained within the pockets and extending throughout the length of the cylindrical portion of the bag, a carbonaceous filler contained within and distending the bag, a detonator embedded in the carbonaceous filler, a fuse extending out through the neck of the bag, a tie adapted to hold the collapsed end of the bag snugly about the fuse, the bag, the contents and the celotex lining being all impregnated with liquid oxygen.

GEORGE A. MERCHANT. ROLAND MILAN. 

